Crossword Genius

Irish county bordering Roscommon (4)

Ross

I believe the answer is:

mayo

(Other definitions for mayo that I've seen before include "Cold, creamy sauce (abbr)" , "Salad dressing (informal)" , "Irish county; dressing" , "Saucy thing" , "County of Western Eire" .)

I've seen this clue in The Sun.
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